Carbureter.



L. M, FRANCISCO.

CARBURETBR.

APPLIOATION FILED P EBJZ, 1914.

Patented Mar. 2

' 2 SHEETS-SHEET 1.

A TTRNEYS L. M. FRANCISCO. GARBURBTER.

APPLICATION FILED PEB.12, 1914 1,1 30,502. Patented Mar.2,1915.

2 SHEETS-SHEET 2.

IIllltlglllullllm w/T/VESSES "CLU lltllllldlldm @lllldllflllt 'LYNN MYERS RNCSC, '0l-' EALDWINSVXLL'E, NEW' ARBUBJETER.'

aisance.

Specification of Letters latent.

Patenten raar.. a, raie..

Application led February l2, i914. ierial No. $13,275.

sene as a fuel.

Objects of my invention are to provide a novel and edective means associated with the nozzle, to heat the latter, and thereby heat the fuel in the passage from the float chamber to the nozzle, as well as to furnish heat for the ioat chamber itself; to provide in connection with the air intake, a novel means for utilizing the heat from the exhaust pipe to heat the air in an effective manner; to provide an air chamber within the body of the carbureter so arranged that warm air from the` air-heating means will raise the temperature of the carburetor body and contribute to the heating of the float chamber; to provide al novel arrangement of valve-controlled, auxiliary air inlets, the valve means of which is adapted to ber-actuated by the opening of the throttle; and to provide for simultaneouslyV lifting the auX- iliary air valve and the needle valve, for ref gulatingl the fuel supply by the opening of the throttle, so that'the amount of air and fuel admitted under high speed with the throttle open, will be increased.

rlhe invention resides in the novel means for carrying out the stated objects of rthe invention and the additional objects that willappear fromthe more specific descrip- .tion following. Y

Reference is to be had to the accompanying drawings forming apart of this speciication, in which Isimilar charactersof reference indicate corresponding parts in all the views.

Figure l is a vertical section of a carbureter constructed in accordance with my invention; Fig. 2 is a horizontal section on approximately the line 2 2 of Fig. 1; and

vWF ig. 3 is a side elevation, the viewbeing taken at right angles to Fig. 1, and including a heater for the air passing to th'e intake.

In constructing a carbureter in accordance with the particular embodiment yillustrated as an example, an annular' float chamber 10 is provided at the under side of the carbureter concentric with the nozzle and mixing tube or choke tube hereinafter referred to. Vl`he float chamber has an inlet 11 at the bottom as usual, which in practice is connected with any convenient source of supply, the

inlet being commanded by a float valve 12, as is customary, the valve being carried by a lever 13, one arm of which is connected withthe float 14C. lThe float chamber has a' screw plug 10a above the valve l2, to afford access to the. latter, as usuali* A passage 15 leads from the float cham-` beiI to a nozzle `16, the terminal and discharge outlets of which may bein accordance with approved practice. Commanding the nozzle is a needle valve 17, to be hereinafter more particularly referred to.

'lhe air intake 18 has connected therewith a supply 'pipe 19, and the `latter leads from a heater casing 20.which surrounds the eX- haust pipe 21 of the engineLthe-casing being generally of T-form presenting opposite inlet ends Q3 aroundthe exhaust pipe. The center of the casing is bulged or enlarged as at 22, to provide an annular heating chamber communicating with' the pipe 19 leading4 to the intake 18. The enlargement of the casing, as at 22, provides for a large ,volume of air within .the heater, so that the air will be retarded between the inlets 28 and the passage to the air intake. with a view to provide for the more eective heating of the air than if it were permitted to pass more rapidly and directly to the carbureter.

The air intake 18 leads to an air chamber 24 provided by bulging the body in line with the air intake, and the body of the carburetor at the bottom of the air chamber, as at .9J-ila, forms the top ofl the oat chamber 10, and thereby the heated air in the said air chamber will contribute to' the heating of the float chamber 10, to maintain the fuel therein in a heated condition, which is desirable in the case of a fuel of'thev character of' kerosene.

Concentrically disposed in the air chamber 24, and depending from the top thereof,

is the mixing tube or'choketube 25, the

berl V24 into afbo'nnct 26,"the outlet 27of which has the usual'flange 28 for connection withj-the manifold ,intake of the engine,A

Which i's indicatedin part at 28a.

In order to provide for an auxiliary air' supply under high'speed,an auxiliary valved inlet is provided, and'in connection With the valve thereof and with the needle valve commanding the nozzle, I' provide mea-ns to ac- -tuate the valves by the opening of the throttle. For' the indicated purpose the up-` per end 29 of the mixing tube or choke tube 25 is made flaring and formed with an inlet or inlets 30'leading Cto the interior from the air chamber 24. The inlets 3 0 are commanded by a tubular fiared valve 3l, adapt-v ed' to seat on the flared inner surface of the extension 29. A spring 32, here shown as helical, bears at its lower end on'a spider 34, connectingv said valve 3l with the sleeve 35 v surrounding the needle valve-17, the spring .Jhead or fiange 36, beneath which is aliftf at its upper end abutting av fixedV spider 33 in the bonnet 26.*- The hub 33a of the spider v 33 affords-guided movement-to the sleeve 35 of the Y airvalve. f

The upper end of the sleeve 35 has a Y ing fork 37 to be operated from the throttle character of the valve and its extension, itA

. lever, las hereinafter explained.- Above the fange 36' on the sleeve a collar 38 or equivalent projection is formed' on 'the needle valve 17, so .that the raising ofthe fork 37 vvill lift the ain-valve by-contactwith the flange 36,' and Will lift the needle valve by -contact of the said flange 36 with `the collar 38. The upper end of the needle valve may' have movement .in a projection. 39 on the bonnet 26.

It Will be observed from Fig. 1, that the valve 31 has a cylindrical tubular extension fitting within the mixing tube 25 so that the valve has guided movement, andthe tubular .will be observed, affords free passage for the mixture of air and fuel drawn upward through the mixing tube Q5, the passage'of the fuel mixturenot being impeded by the auxiliary valve Whether the latter be seated or unseated.

ln order to heat the nozzle and 4to contribute to' the heating of the float chamber,

an electricj heater is arranged beneath the nozzle, at the center 4of the float chamber.

In the example shown, a heating element 41 isvcoiled around a Stud 42 depending from the base of the' nozzle'l. The' terminals of the heating elements are secured to binding posts 43 ontheh" equivalents,.on a capf4-4 which closes the lower end of the heating chamber 40' in which the coil is located.l Thusj thei heat generatedI by the electric l heater Will effectively heat'thenozzle andv the passage 15 leading thereto, as Well as Vthe float chamber, thereby maintaining the fuel .at the proper temperature.

The means for operating the air valve and needle valve by the opening of the throttle consistsfin the example shown, of a link 48' connecting the throttle lever 47 with a ters Patent:

l. l'n'a. carbureter, a mixing tube, means to' conduct air to .sa1dtube, a fuel nozzle dlscharging into said tube and having a base beloeY the latter, 'a heating chamber beneath the nozzle, and `means for heating said chamber, saidheating means comprising a an electric heating element around said stud. 2. In a carbureter, a mixing tube having a main air'inlet, and anauxihary air-inlet -above the nia-in inlet, a. fuel vnozzle dischargi'ng to the mixing tube below the auxiliary pendent stud? on the base of the nozzle and air inlet, a needle valve commanding the nozzle and extendingupwardly through vthe said tube, a valve commanding the air inlet and disposed at the interior of the tube, the

flatter valve havinglaf sleeve through which the'needle valveextends, 'a throttle lever, a lifting member operatively connected With the throttle lever, a member on one of said valves with which the lifting 'member engages, and a member on the other of said valves -with which the member on the rst valve engages, so that the action of the/lifting member willliftboth valves.

3. In a carburetor, a.- mixing tube having a main air inlet, and an auxiliary air inlet abovethe main air inlet, a fuel nozzle discharging to said tube, a tubular valveat the interior of the mixing: tube and commanding theauxiliary air inlet, a helical spring bearing at its-lowerendon said valve, a fixed abutment against which the upper end of the spring bears, asleeve extending up- Wardly through the said abutment and in fixcdrelation to "the valve. a needle valve through said sleeve, athrottle, a throttle l valve, and means operative'mby said throttle valve and adapted to actuate both of said valves.'

A In testimony whereof I- have signed my name to this specification in the presence oftWo subscribing Witnesses.

Witnesses:

MICHAEL DELANEY," H. C. BUNBURY,

LYNN MYnRs FnANoisco.- 

